Ilmor 625 vs Merc 525 vs 700hp 540ci EFI... - Page 3
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Ilmor 625 vs Merc 525 vs 700hp 540ci EFI...

  1. #29
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    here you go.... mercury rates their motors hp's at the prop, in other words you are getting about 540 at the crank and 525 at the prop with a mercury 525 if not more.

    ilmor rates strictly at the crank so you are getting 625 at the crank and around 605 at the prop on a good motor.

    Weight of the boat makes a big difference as well. Mercury can handle the weight on heavy boats a lot better then an ilmor, figure an ilmor as a small block 350 with 2 more cylinders bolted onto the back. Components in a ilmor are much easier to stress due to there smaller size hench the weight difference between a ilmor engine and a mercury motor. Sure ilmor has an aluminum block compared to a cast iron like a mercury, but the ilmor is a much longer block due to the extra cylinders. Mercury uses much bigger components inside the block, this is where most of its weight comes from.

    ilmor motors are ran on a much less conservative setting than mercury. in other words you can turn a mercury motor up (advance its ignition, add a blower) and get more power where a ilmor there are no upgrades available. Mercury sends their stock motors out on a very conservative setting.

    just purchased a new boat myself, the ilmor 710 did about 93 and the mercury 700 (what i went with) does 100. The mercury 700sci weighs about 300 pounds more than the ilmor 710 and still out performed it.

    Maintenance is much easier, drive options are better (you can now order the 525 with an NXT drive, which i highly recommend if in your price range).

    don’t get me wrong the ilmor will probably out perform the mercury due to the horsepower difference but not by as much as you would think.

    sorry for the spelling mistakes, in a hurry..
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  3. #30
    28 Powerplay - HP500 RLJ676's Avatar
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    Quote Originally Posted by 2FORCEFULL View Post
    I don't know about that, I went over to elsinore and look'd at it, pretty nice, might be a keeper......


    did punchy sell his boat already????
    Check the date of the original post.

  4. #31
    Hanging Member Punchy's Avatar
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    Seriously.....a bit slow are we fellas? This thing's so old I'd already forgotten I'd posted it...


    "...There is no way, NO WAY that you came from my loins......... Junior, remind me when we get home to punch your mama....right in the mouth...." -Buford T. Justice

  5. #32
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    r u glad u went with the 525? What r u getting out of the boat?

  6. #33
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    Quote Originally Posted by Punchy View Post
    Seriously.....a bit slow are we fellas? This thing's so old I'd already forgotten I'd posted it...
    Hey, some of us caught it.

  7. #34
    Az Desert Dweller LV R SCHIADA'S's Avatar
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    Brummett EFI Twin Turbo, 540 cu in, hands down, screw the rest !!!

  8. #35
    "BOUGHT NOT BUILT" 2FORCEFULL's Avatar
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    Quote Originally Posted by RLJ676 View Post
    Check the date of the original post.
    I thought the motor was in in nov.... but I didn't notice this was drug out of the past


    lock the door on 08 I had enough already

  9. #36
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    Quote Originally Posted by 2FORCEFULL View Post
    lock the door on 08 I had enough already
    That sounds like a good plan.

  10. #37
    It is what it is Outdrive1's Avatar
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    Anything under 750hp is gay.
    .
    Hey stalker, don't go away mad, just go away.

  11. #38
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    Quote Originally Posted by Outdrive1 View Post
    Anything under 750hp is gay.
    chin nuts and man ranch is gay......625hp is cool

  12. #39
    It is what it is Outdrive1's Avatar
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    Quote Originally Posted by 2FORCEFULL View Post
    625hp is cool
    Maybe at the Elks club.
    .
    Hey stalker, don't go away mad, just go away.

  13. #40
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    Quote Originally Posted by Outdrive1 View Post
    Maybe at the Elks club.
    yeah, well at least there anit no man ranch

  14. #41
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    I think too many people get hung up on horsepower and not the real reason what pushes a boat through the water which is torque. That is why diesels are on the hott ticket right now as well as 10 cylinder gasoline engines such as the Ilmor engines. Its all about the torque curve not so much about the horsepower. From what is said in previous post it seem that GM is about done with any BBC product (496) and possibly going to a supercharger SBC (LS model) engine for future applications due to cost and emissions issues. all respectible engine builders from what i have seen try to build their engine with a broad respectable torque range.

  15. #42
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    Quote Originally Posted by freakdave View Post
    I think too many people get hung up on horsepower and not the real reason what pushes a boat through the water which is torque. That is why diesels are on the hott ticket right now as well as 10 cylinder gasoline engines such as the Ilmor engines. Its all about the torque curve not so much about the horsepower. From what is said in previous post it seem that GM is about done with any BBC product (496) and possibly going to a supercharger SBC (LS model) engine for future applications due to cost and emissions issues. all respectible engine builders from what i have seen try to build their engine with a broad respectable torque range.
    seems to me that boat builders should just get out of cal all together

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